1. This transaction was effected pursuant to a 10b5-1 trading plan adopted by the reporting person.

2. Represents the weighted average sale price. The lowest price at which shares were sold was $24.27 and the highest price at which shares were sold was $25.09. The reporting person undertakes to provide upon request to the staff of the U.S. Securities and Exchange Commission, the issuer or its stockholders, full information regarding the total number of shares sold at each separate price within the ranges set forth herein.

3. The securities are held of record by The Bradley and Jennifer Pileggi Trust, of which the reporting person is trustee.

4. The option vests as to 1/4 of the shares on the anniversary of the June 8, 2015 vesting commencement date, and then 1/48 of the total shares vest monthly thereafter, with 100% of the total shares vested on June 8, 2019, subject to the reporting person's provision of service to the issuer on each vesting date. The option contains an early-exercise provision and is exercisable as to unvested shares, subject to the issuer's right of repurchase.

5. Each share of the issuer's Class B Common Stock will convert into 1 share of the issuer's Class A Common Stock (a) at the option of the holder and (b) automatically upon (i) any transfer, except for certain permitted transfers, and (ii) the date that is the earliest of (x) the date specified by a vote of the holders of not less than 66 2/3% of the outstanding shares of Class B Common Stock, (y) ten years from the effective date of the issuer's initial public offering and (z) the date that the total number of shares of outstanding Class B Common Stock ceases to represent at least 5% of all outstanding shares of the issuer's common stock, and has no expiration date.

Remarks:

/s/ Jennifer Pileggi

09/12/2018

** Signature of Reporting Person

Date

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person,
see
Instruction
4
(b)(v).